Improvement in friction-pulleys



UNITED STATES PATENT OFFICE.

EDWIIN F. ALLEN, OF PROVIDENCE, RHODE `ISLAND, ASSlGNOR TO HIMSELF,CHARLES CAMPBELL, AND ELMER A. BEAMAN, OF SAME PLACE.

IMPROVEMENT IN FRICTICN-PULLEYS. I

Specification forming partof Letters Patent No. 108,749, dated Novemberl, 1870.

To all whom it may concern:

Be it known that I, EDWIN F. ALLEN, of the city and county ofProvidence, State of Rhode lsland, have* invented a new and usefulImprovement in a Friction-Pulley g and I do hereby declare that thefollowing is a full and exdescription thereof, reference being had tothe accompanying drawing and to the letters of reference marked thereon.

The nature of myinvention consists in combining a friction-spring,griping-bar, shippersleeve having a taper bar and disk with a pulleyhaving an outer and an inner rim, so that by the movement of theshipper-sleeve theinner rim of the pulley is compressed by thefriction-spring, holding it rmly, so that the disk, to which thefriction-sprin g is inseparably attached, is made t'o revolve with therevolution ofthe pulley.

The construction and operation of my invention are as follows:

Figure 1 represents the pulley cut through the center, with other partsattached. A A is the outer rim of the pulley. B is the shaft aroundwhich the pulley revolves. C C is the inner rim of the pulley.

Fig. 2 represents the disk separated from the pulley, with theshipper-sleeve, and also an edge view ofthe griping-bars. D D is thedisk separated from th e pulley, havin g attached to, connected with,and forming part of, said disk D the friction-spring, designated byletters E E, the projecting ends of said frictionspring E E passingthrough and opening inside of said disk D D. F is an edge view of thegriping-bars. G is the shi pper-sleeve, with its taper bar in positionto act in connection with the griping-bars F. H is the screw or` boltwhich holds the friction-spring E, forming a part of disk D, asaforesaid, in its place. At the point where the screw H is inserted thefriction-spring E is thickened to give sufcient strength for thefrictiou-sprin g lo receive the bolt or screw H. The spring E at pointI-I abruptly changes its direction at both ends, and, bending outward,passes through an opening in the disk D. L is the screw holding thegriping-bars F in their place. J is a plate used for a support of thegriping-bars F. K is a spiral spring connecting with the gripingbars,keeping them in the right place, and allowing, at the same time, for themovement necessaryto the operation of the pulley in its combinations I Iis an adjusting-bolt with check-nuts to take up the wear. Q is a splinerunning through the disk D to keep it from turning, and extendingthrough the shippersleeve G for the same purpose.

` Fig. 3 is afront view of the griping-bars on the outside of the disk,in position to act in conjunction with the other parts of the pulley. Italso presents a view of the inside of the pulley. (The letters in thisfigure represent the same =parts as similar letters in Figs. 1 and 2.) AA is the outer rim of the pulley. C C is the inner rim of the pulley. DD is the disk, having E E, the friction-spring, attached to,

connected with, and forming part of the disk- D D. F F are thegriping-bars. I Iis an adj usting-bolt holding the lower part of thegriping-bars in its place. K is the spiral spring attachedto thegriping-bars, so that they will allow the two parts to separate when thetaper-bar is introduced between them, and yet bring them back to theiroriginal position after the taper-bar is withdrawn. J is the plate usedfor a support to the griping-bars. L L are the screws holding the upperpart of the gripingbars onto the disk, but not so firmly as to preventthe two arms of the griping-bar to move when the lower parts areseparated by the insertion of the taper-bar. By means of this the twoends of the friction-spring which penetrate the opening in the disk Dare compressed by the upper part of the griping-bars as they are broughttogether. N is the opening under the shaft, through which the taperbarisforced when the friction-power is sought. The circular opening above, N,between the gripingbars F F, represents the place through which theshaft goes.

Fig. 4 is a perspective view or" a shippersleeve with ataper-bar. Gisthe shi pper-sleeve; M, Vthe taper-bar connected with it.

Fig. 5 is an edge view of the disk, L being the screw holding thegriping-bar in position; B, the shaft, and Q the spline, as described inFigs. l and 2.

Fig. o is the interior view of the disk, being the opposite side to thatrepresented by Fig. 3. O is the openingin the disk through which the twoends of the friction-sprin g E E project to operate on the other side;in conjunction with the griping-hars. N is the opening under-the shaft,through which the taper-bar is forced bythe movement of theshipper-sleeve.

The mode of operating this improved friction-pulley is as follows:Suppose the pulley to be revolving loosely upon the shaft, the inner rimnot being compressed by the frictionspring, and the power not being usedwhich is necessary for mechanical use. It is desired to make the pulleyavailable in moving other machinery. The shipper-sleeve is moved by theordinary shipper-arm, and this presses the taper-bar M through theopening N in the disk. In passing this opening the taper-bar pressesaside the adjustingbolts I I. This forces asunder the lower parts ofgriping-bars F F. As the griping-bars are separated, being soconstructed that the upper parts will approach in proportion as thelower parts are separated, the Lipper endsv approach each other. By thisapproach they press the projecting ends of the friction-spring Etogether as they appear` therefore, revolves after such compression itcompels the revolution of the disk and of all the machinery attachedthereto. By a single motion of the shipper-sleeve this result is accomplished.

I do not claim the exclusive right to use any of the parts, except thedisk D, alone and apart from the combinations mentioned.

What I claim, and desire to secure by Letters Patent, is-` 1. The disk Dhaving attached to and connected with it the friction-spring E, whichfriction-spring E forms a part of said disk D.

2. The disk D having attached to andconnected With it the friction-spring E, which friction-spring E forms a part of said disk D, in combinationWith the griping-bars F F, or their equivalent, operatin g togethersubstantially as described, and for the aforesaid purposes.

3. The combination ofthe disk D having the friction-spring E attachedto, connected with, and forming a part otl said disk D, with thegriping-ba-rs F F, and the shipper-sleeve G, and taper-bar M, and apulley having an outer and an inner rim, or their equivalents, op.-erating together substantially `as described, and for the purposesspecified.

A EDWIN F. ALLEN,

Viitnesses:

J AMEs H. LAMoNs, STEPHEN A. COOKE, Jr.

